Special anti-counterfeiting paper and features in picture book printing
In the manufacturing process of watermark paper, technical methods can be used to make the required logos and patterns into the paper. These patterns are usually not easy to see. They can be seen only in the face of strong light. It is recognized by anti-counterfeiting experts around the world as An effective anti-counterfeiting technology, banknotes, important international documents, facility drawings and various tickets in most countries are also printed on watermarked paper. In addition to the use of watermarks in currency paper, they have also been widely used in album printing. The position of the watermark in the paper is fixed, unfixed and semi-fixed. In the manufacturing process, it integrates complicated technical processes such as design, engraving, screen making, and papermaking, so it often makes the counterfeiters helpless. Checking the watermark is also one of the effective methods to identify true and false.
2. Safety line
The safety thread refers to placing a gold or plastic thread in the middle of the paper during the papermaking process. The security thread is made of special gold thread. Now plastic thread is used and has been developed into various types, such as micro letter security thread, fluorescent security thread, etc. The shape of the safety line includes straight lines, wavy shapes, and zigzag shapes.
3.Red or blue fiber silk or colored dots
During the papermaking process, red and blue fibers or colored chips (dots) are mixed into the pulp, or sprinkled on the surface of the paper before the paper is unshaped, and there is fluorescent reflection under ultraviolet radiation. Red and blue fiber yarns and colored dots have two kinds of fixed positions and unfixed positions in the paper.
4. Anti-copy paper
After copying this kind of paper, the words "copy" and "invalid" will appear, which can effectively prevent color copying of important documents. Another type of full absorption anti-copy paper has a blue or brownish red appearance. The text on the paper can only be seen through light, and its copy is completely black.
5, non-fluorescent special paper
Generally, paper shows fluorescence under ultraviolet irradiation. Therefore, banknote printing paper and some securities or bills use non-fluorescent special paper for security. For example, the paper bases of various countries, passports, and the paper base of some tickets are non-fluorescent, so it is easy to reveal the fluorescent pictures and texts with additional secrets. Book printing technology, such as multi-color serial printing, multi-color serial printing is also called cross-color printing or rainbow printing. Generally, it is printed by letterpress printing machines. It is based on the requirements of printed products. Separate plates are filled with inks of various colors. Under the action of the ink roller, the inks of the adjacent parts are mixed and then transferred to the printing plate. With this printing process, multiple colors can be printed at once, and the intermediate transition is soft. Because it is difficult to see the placement distance of the ink tank partition from the printed product, it can also play a certain role in anti-counterfeiting. If this process is used on large-area shading printing, its anti-counterfeiting effect is outstanding.